Mobile games are the easiest to get into (since you can rely on the app distribution models from Apple, Google, and Microsoft) and you don't need to think too much about cramming your software into a box.
Our game is called Bouncy Mouse, and we're about to release our first major update with new content and new game modes. We've got over 1 million downloads on Android, but fewer on iOS since discoverability on iTunes is difficult due to major companies buying their way into the top spots through ads and promotions. Competing on iOS is hard primarily due to this reason, though Apple did feature us for a week or two, which was great.
The classic gaming market is still huge and healthy. I would like to branch out into that market once we have some more resources (e.g. once we're larger than two people and have a little cash to finance bigger budget art, music, design, etc.)
You can check out our website here. :) http://www.bouncymousegame.com/